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Old 04-05-2017, 03:29 PM
Maxbumpo Maxbumpo is offline
Diesel Preferred
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,778
There may be another heat exchanger between coolant and engine oil, on the oil pan. I don't remember which side of the pan for sure, I think the driver's side. However, a leak there would normally go the other way - coolant into the engine oil.

If the front of the gasket looked like it was breached at the oil passage between #1 cylinder and the timing chain case, that is probably your culprit and certainly something that needed to be fixed with a new gasket.

Proper pressure testing the coolant passages requires a special plate bolted to the head, and the head immersed in a hot tank (80 deg C), and then the coolant passages are pressurized while you watch for bubbles. I made a poor man's version by only pressurizing the exhaust manifold, using a 55 gallon drum cut in half as the hot tank.
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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